scholarly journals Mapping the multi-decadal mangrove dynamics of the Australian coastline

2020 ◽  
Vol 238 ◽  
pp. 111185 ◽  
Author(s):  
Leo Lymburner ◽  
Peter Bunting ◽  
Richard Lucas ◽  
Peter Scarth ◽  
Imam Alam ◽  
...  
Keyword(s):  
Mangrove Dynamics ◽  
Australian Coastline

scholarly journals Forest Structure and Projections of Avicennia germinans (L.) L. at Three Levels of Perturbation in a Southwestern Gulf of Mexico Mangrove

Forests ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 989
Author(s):  
Basáñez-Muñoz Agustín de Jesús ◽  
Jordán-Garza Adán Guillermo ◽  
Serrano Arturo
Keyword(s):  
Size Structure ◽  
Transition Probabilities ◽  
High Sensitivity ◽  
Avicennia Germinans ◽  
Mangrove Forests ◽  
Mangrove Species ◽  
Adult Trees ◽  
Mangrove Dynamics ◽  
Projection Matrices ◽  
Partial Tree

Mangrove forests have declined worldwide and understanding the key drivers of regeneration at different perturbation levels can help manage and preserve these critical ecosystems. For example, the Ramsar site # 1602, located at the Tampamachoco lagoon, Veracruz, México, consists of a dense forest of medium-sized trees composed of three mangrove species. Due to several human activities, including the construction of a power plant around the 1990s, an area of approximately 2.3 km2 has suffered differential levels of perturbation: complete mortality, partial tree loss (divided into two sections: main and isolated patch), and apparently undisturbed sites. The number and size of trees, from seedlings to adults, were measured using transects and quadrats. With a matrix of the abundance of trees by size categories and species, an ordination (nMDS) showed three distinct groups corresponding to the degree of perturbation. Projection matrices based on the size structure of Avicennia germinans showed transition probabilities that varied according to perturbation levels. Lambda showed growing populations except on the zone that showed partial tree loss; a relatively high abundance of seedlings is not enough to ensure stable mangrove dynamics or start regeneration; and the survival of young trees and adult trees showed high sensitivity.

Mangrove dynamics in the southwestern Caribbean since the ‘Little Ice Age’: A history of human and natural disturbances

The Holocene ◽  
2010 ◽  
Vol 20 (6) ◽  
pp. 849-861 ◽  
Author(s):  
Catalina González ◽  
Ligia Estela Urrego ◽  
José Ignacio Martínez ◽  
Jaime Polanía ◽  
Yusuke Yokoyama
Keyword(s):  
Little Ice Age ◽  
Ice Age ◽  
Natural Disturbances ◽  
History Of ◽  
Mangrove Dynamics

The characterisation and provenance of crude oils stranded on the South Australian coastline. Part I: Oil types and their weathering

2021 ◽  
Vol 167 ◽  
pp. 112260 ◽  
Author(s):  
Alexander J. Corrick ◽  
Philip A. Hall ◽  
Se Gong ◽  
David M. McKirdy ◽  
Christine Trefry ◽  
...  
Keyword(s):  
Crude Oils ◽  
The South ◽  
Australian Coastline

Long-term migration patterns and bisexual philopatry in a benthic shark species

2017 ◽  
Vol 68 (8) ◽  
pp. 1414 ◽  
Author(s):  
Nathan Charles Bass ◽  
Johann Mourier ◽  
Nathan A. Knott ◽  
Joanna Day ◽  
Tristan Guttridge ◽  
...  
Keyword(s):  
Management Strategies ◽  
Movement Patterns ◽  
Conclusive Evidence ◽  
Migration Route ◽  
Shark Species ◽  
Apex Predators ◽  
Arrival Times ◽  
And Bisexual ◽  
Australian Coastline ◽  
Port Jackson

Knowledge of the broad-scale movement patterns of sharks is essential to developing effective management strategies. Currently there is a large bias in studies focusing on species that are either large apex predators or found in tropical to subtropical regions. There is limited knowledge of the movements and migrations of benthic and temperate shark species. The present study used passive acoustic telemetry to investigate the movement patterns of a benthic shark species, the Port Jackson shark (Heterodontus portusjacksoni). Individuals were tagged with acoustic transmitters between 2012 and 2014 and their movements were monitored within Jervis Bay and along the east Australian coastline for up to 4 years. Male and female Port Jackson sharks demonstrated high levels of philopatry to both Jervis Bay and their tagging location across multiple years. Although males and females did not differ in their arrival times, females departed from Jervis Bay later than males. Approximately half the tagged individuals migrated in a southward direction, with individuals being detected at Narooma, Bass Strait and Cape Barron Island. This study provides conclusive evidence of bisexual philopatry in a benthic temperate shark species, confirming previous hypotheses, and presents the most detailed migration route for Port Jackson sharks to date.

Spawning and fecundity of the western king prawn, Penaeus latisulcatus Kishinouye, in Western Australian Waters

1980 ◽  
Vol 31 (1) ◽  
pp. 21 ◽  
Author(s):  
JW Penn
Keyword(s):  
Spawning Season ◽  
Ovary Development ◽  
Southern Population ◽  
Spawning Frequency ◽  
Total Length ◽  
Australian Coastline ◽  
The Individual ◽  
Western Australian

The microscopic and macroscopic changes which occur during ovary development to spawning have been investigated for P. larisulcatus. The latter stages (3 and 4) of development and the act of spawning have been found to be confined to single intermoult periods, with spawning being possible during each of a series of consecutive intermoult periods. Fecundity was found to vary significantly with the size of the individual, with the number of eggs ranging from approximately 105000 (123 mm total length female) to 650000 (217 mm total length female) at each spawning. The use of an index of population fecundity in combination with estimates of spawning frequency to document spawning seasons is discussed. Using the population fecundity method the two northern populations have been shown to have a year round spawning season, with maximum spawning occurring from autumn to spring. while the southern population was shown to have shorter seasons over summer. A relationship between ovary development and temperatures in excess of 17�C is suggested as the probable cause of the differences in duration of spawning seasons along the Western Australian coastline.

scholarly journals Quantitative Assessment and Driving Force Analysis of Mangrove Forest Changes in China from 1985 to 2018 by Integrating Optical and Radar Imagery

2020 ◽  
Vol 9 (9) ◽  
pp. 513
Author(s):  
Yuhan Zheng ◽  
Wataru Takeuchi
Keyword(s):  
Socioeconomic Development ◽  
Driving Forces ◽  
Landsat Imagery ◽  
Mangrove Forests ◽  
Array Type ◽  
Novel Approach ◽  
Radar Imagery ◽  
Mangrove Dynamics ◽  
Driving Force Analysis

Mangrove ecosystems are valuable, yet vulnerable, and therefore they have been an important subject of protection and restoration in China. Reliable information on long-term China mangrove dynamics is lacking but vital to analyze the driving forces and evaluate the efforts of mangrove conversation. This study aims to quantify the conversions among mangroves and other land covers with high accuracy. The updated mangrove base map for 2018 was produced by integrating Advanced Land Observing Satellite (ALOS) Phased Array type L-band Synthetic Aperture Radar 2 (PALSAR-2) yearly mosaics and Landsat imagery with an overall accuracy of 95.23 ± 6.02%. Then, a novel approach combining map-to-image and image-to-image methods was proposed to detect the changed pixels in mangrove forests from 1985 to 2018. The mangrove base map was adopted to mask the images from other years. To determine the changed pixels, the differencing values in the masked area between two images were calculated and compared with the corresponding thresholds. Based on the changed pixels, the possible driving forces were analyzed and associated with socioeconomic development. The resultant mangrove dynamics demonstrated that mangrove forests in China experienced a tendency of loss first and recovery later during the past 30 years. Most mangrove gains came from aquaculture and mudflat, whilst losses were due to the built-up construction and aquaculture reclamation. These conversions indicated that mangrove deforestations were mainly due to human-induced destruction, while the recoveries were strongly associated with conservation and restoration actions.

Implications of mangrove dynamics for private and use in bragança, north Brazil: a case study

2002 ◽  
Vol 8 (1) ◽  
pp. 97-102
Author(s):  
Lara Rubén ◽  
Szlafsztein Claudio ◽  
Cohen Marcelo ◽  
Berger Uta ◽  
Glaser Marion
Keyword(s):  
North Brazil ◽  
Mangrove Dynamics

THE ORIGINS OF COASTAL BITUMENS FROM WESTERN AUSTRALIA

1994 ◽  
Vol 34 (1) ◽  
pp. 787
Author(s):  
R. Alexander ◽  
T.J. Currie ◽  
R.I. Kagi
Keyword(s):  
Organic Matter ◽  
Crude Oil ◽  
Source Rock ◽  
Western Australia ◽  
Se Asia ◽  
Indonesian Archipelago ◽  
Organic Matter Type ◽  
Oil Seep ◽  
Australian Coastline ◽  
Depositional Setting

A total of 83 samples of stranded bitumens collected from the western and southern coasts of Western Australia have been classified into eight groups on the basis of their biomarker compositions. The source rock characteristics inferred for these bitumens, in terms of organic matter type and depositional setting indicated by the biomarkers, suggest strongly that the bitumens originate from a variety of areas in SE Asia in the vicinity of the Indonesian archipelago. In fact, in seven of the eight cases a good correlation is observed between biomarker composition of each bitumen group and a produced crude oil or oil seep from this region. The bitumens are transported to and around the Australian coastline by a system of ocean currents.

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